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New Records and Synonymies of Hawaiian Bivalves (Mollusca)1

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New Records and Synonymies of Hawaiian Bivalves (Mollusca)1 18 New Records and Synonymies of Hawaiian Bivalves (Mollusca)1 GUSTAV PAULAY (Marine Laboratory, University of Guam, Mangilao GU 96923) Our present understanding of the Hawaiian bivalve fauna stems from Dall, Bartsch & Rehder’s (1938; hereinafter DBR) exhaustive survey and Kay’s (1979) reanalysis of the fauna. Although previous studies (notably Conrad 1837 and Pilsbry 1917–1921) described several species, DBR were the first to comprehensively treat the fauna, recognizing 190 Recent and fossil species, of which they described 137 as new. Their survey was also note- worthy in that it considered the vast majority of the species encountered to be endemic to Hawaii. They named every Hawaiian species known in the fauna that was not already described from a collection made in Hawaii, with 3 exceptions: Navicula [= Arca] ventri- cosa (Lamarck, 1819), Quidnipagus palatam Iredale, 1929 and the introduced Venerupis (Ruditapes) philippinarum (Adams & Reeve, 1850). Kay (1979) published the first and only major overhaul, synonymizing many putative endemics with species described from other localities and even each other, and adding 16 species not included in DBR. Ongoing studies indicate that the majority of DBR’s species are not endemic to Hawaii: many are junior synonyms of widespread Indo-West Pacific taxa (and often of each other), others, although validly named, also occur elsewhere. As with opisthobranchs (Gosliner & Darheim in review), the history of the Hawaiian bivalve fauna will be one of decreasing endemicity as the fauna receives more study. The anomalously high endemicity of Hawaiian bivalves (Kay & Palumbi 1987) is simply a taxonomic artifact. The present paper is the first in what is planned to be a series of studies revising the Hawaiian bivalve fauna. Here I bring together 27 recent records, synonymies and gener- ic reassignements encountered in the literature, using Kay’s (1979) fauna as a starting point2. I also add 6 new records, provide documentation for 3 new synonymies needed for other studies, and remove one species from the fauna. The distribution of all species treat- ed is noted. All new records here reported are of adventive species, and although their USNM labels are varied, all appear to be based on surveys by Lt. Cdr. Henry Ryder of ship bottoms in Pearl Harbor between 1950–1951, deposited at the USNM ex the A.E. Mehring collection. Abbreviations: USNM: United States National Museum of Natural History; DMNH: Delaware Museum of Natural History; MCZ: Museum of Comparative Zoology, Harvard Univ.; BMNH: The Natural History Museum, London (formerly British Museum (Natural History)); ZMC: Zoological Museum, Copenhagen; UGI: University of Guam Invertebrate Collection. Summary of status changes discussed in this paper Previously published generic reassignments: Present combination From Adipicola pacifica (DBR, 1938) Terua Adipicola crypta (DBR, 1938) Terua Cosa waikikia (DBR, 1938) Limopsis Laevichlamys irregularis (Sowerby, 1842) Chlamys originally from Pecten Globivenus toreuma (Gould, 1850) Venus 1. Contribution No. 1996-002 to the Hawaii Biological Survey. 2. New records documented in Burch (1995) and Burch & Burch (1995) in the Records of the Hawaii Biological Survey for 1994 are not included below. Moretzsohn & Kay (1995) provide an updated checklist, but only add 2 new records and note 2 nomenclatural changes for bivalves. As some of of these changes are problematic, they are all reviewed below. RECORDS OF THE HAWAII BIOLOGICAL SURVEY FOR 1995 19 Previously published synonymies: Senior synonym Junior synonym Botula fusca (Gmelin, 1791) Botula hawaiensis DBR, 1938 Botula fusca (Gmelin, 1791) Botula laysana DBR, 1938 Lithophaga (Leiosolenus) obesa Lithophaga hawaia DBR, 1938 (Philippi, 1847) Cryptopecten bullatus Cryptopecten dalli DBR, 1938 (Dautzenberg & Bavay, 1912) Spondylus nicobaricus Schreibers, 1793 Spondylus hystrix Röding, 1798 Spondylus violacescens Lamarck, 1819 Spondylus tenebrosus Reeve, 1856 Parahyotissa numisma (Lamarck, 1819) Ostrea thaanumi DBR, 1938 Gari (Gari) pennata (Deshayes, 1855) Heteroglypta kanaka Pilsbry, 1921 Gari (Dysmea) occidens (Gmelin, 1791) Dysmea vitrea DBR, 1938 Tellina (Tellinides) ovalis Sowerby, 1825 Angulus hawaiensis DBR, 1938 Tellina (Scutarcopagia) scobinata Linné, 1758 Tellina elizabethae Pilsrby, 1918 Venerupis (Ruditapes) philippinarum Tapes japonica Deshayes, 1853 (Adams & Reeve, 1850) Gastrochaena gigantea (Deshayes, 1830) Rocellaria hawaiensis DBR, 1938 Gastrochaena inaequistriata Jousseaume, 1923 Rocellaria oahuana DBR, 1938 New synonymies: Senior synonym Junior synonym Septifer (Septifer) excisus (Wiegmann, 1837) Septifer vaughani DBR, 1938 Barbatia foliata (Forsskål, 1775) Barbatia (Abarbatia) hendersoni DBR, 1938 Neopycnodonte cochlear (Poli, 1795) Ostrea laysana DBR, 1938 Removed from fauna: Spondylus cuneatus Reeve, 1856 Previously published reinstatement: “Chlamys” russata (Reeve, 1853) Pinna exquisita DBR, 1938 Previously published “new” records: Lithophaga (Leiosolenus) nasuta (Philippi, 1846) Neoaviculovulsa coralicola Okutani & Kusakari, 1987 Nanostrea exigua Harry, 1985 Pectinella aequoris Dijkstra, 1991 Fulvia (Laevifulvia) ballieni Vidal, 1994 Lyonsiella formosa (Jeffreys, 1881) New records: Septifer (Septifer) bilocularis (Linné, 1758) Lopha cristagalli (Linné, 1758) Hyotissa hyotis (Linné, 1758) Chama lazarus Linné, 1758 Chama pacifica Broderip, 1835 Chama brassica Reeve, 1847 20 BISHOP MUSEUM OCCASIONAL PAPERS: No. 45, 1996 Systematic Treatment Mytiloida: Mytilidae Adipicola pacifica (DBR, 1938) Terua pacifica DBR, 1938 Dell (1987) examined Habe’s (1977a) record of this species and concurred that they are conspecific with the Hawaiian type, indicating that the species also occurs in Japan. Dell (1987) showed that Terua DBR, 1938 is a subjective junior synonym of Adipicola Dautzenberg, 1927. Adipicola crypta (DBR, 1938) Terua crypta DBR, 1938 Habe (1977a) recorded this species from Japan, but his record was based on adults compared with a juvenile representing the unique Hawaiian type. Thus Dell (1987) notes that the conspecificity of the 2 collections must await better material from Hawaii, as there are slight morphological differences between them. Generic reassignement by Dell (1987). Botula fusca (Gmelin, 1791) Botula hawaiensis DBR, 1938 Botula laysana DBR, 1938 Wilson & Tait (1984) recognize but Botula fusca in their revision of the genus, and synonymize both Hawaiian nomina under this name. Distribution: Red Sea and E Africa to Pitcairn, Hawaii, and W America, also W Atlantic (Wilson & Tait 1984). Lithophaga (Leiosolenus) obesa (Philippi, 1847) Lithophaga hawaia DBR, 1938 This large date mussel was described from Holocene or Pleistocene shells on Oahu, and has not been collected alive in Hawaii (Kay 1979). It was synonymized with the wide- spread L. obesa by Kleemann (1984). Distribution: Red Sea and E Africa to the Society Is. and Hawaii (fossil) (Kleemann 1984). Lithophaga (Leiosolenus) nasuta (Philippi 1846) Lithophaga hawaia DBR, 1938, in part Kleemann (1984: Fig. 19) records this species from Oahu on the basis of a single specimen found within one of the original lots (USNM 337461) of Lithophaga hawaia (see above). Distribution: E Africa to the Line Is. and Hawaii (fossil) (Kleemann 1984). Septifer (Septifer) bilocularis (Linné, 1758) New state record This species is recorded from Pearl Harbor on ship bottom; whether it is established in Hawaii at present is not known. Distribution: E Africa to the Mariana and Caroline Islands and Niue outside Hawaii (USNM and G. Paulay collection). Literature records from further east require verifica- tion, as juveniles of the species are easily confused with the more widespread and simi- RECORDS OF THE HAWAII BIOLOGICAL SURVEY FOR 1995 21 larly shaped and colored, but much smaller Septifer cumingi Récluz, 1849. Material examined: USNM 699564 - mixed lot of 5 conjoined valves from two collections: 20 Jan. 1950 “boat bottom at Pearl Harbor” and 31 May 1950 “So. Pac. ship bottom at Pearl Harbor”, respectively; both coll. Lt. Com. Henry Ryder. Note with specimens reads “Introduced? Palau” in H.A. Rehder’s hand (A.R. Kabat, pers. comm.); basis for statement unknown. Septifer (Septifer) excisus (Wiegmann, 1837) Tichogonia excisa Wiegmann, 1837 Septifer vaughani DBR, 1938; new synonymy Septifer excisus can be immeadiately distinguished from other members of the genus by the notch in its septal shelf, from which its name presumably derives. It can be further distinguished from other Indo-West Pacific members of its subgenus by the strong bead- ing on the ribs and the frequently raised posterior adductor scar. I have not seen the type(s) of S. excisus, but the interpretation here presented corresponds to the concept of other authors, starting with the first illustration of the species by Reeve (1857: pl. IV, Fig. 13) and Lamy’s (1937) concept in the last revision of the group. This species is well repre- sented in Pleistocene deposits on Oahu (Kosuge 1969). These fossils were initially iden- tified as Septifer kraussii Küster by Ostergaard (1928), but differ from that species (which is closely related to, or is a variety of S. bilocularis, (Lamy 1937), by the above mentioned characters. Distribution: Red Sea and E Africa to the Mariana Islands, fossils from Mangaia (Cook Is.); Henderson (Pitcairn Is.); Oahu (Hawaiian Is.)(Paulay in review). Material examined: Recent: Marianas: USNM 595515 - Lagoon W of Saipan; USNM 595424 - Lagoon W of Saipan, ; USNM 617675 - Pagan I., 2000 yds S of B.M. on point forming
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